Main prod. Group survey
deu
fra
esp
16
Optics and fine mechanics
Fine mechanical instruments
Instruments for navigation, hydrology and meteorology
2111.11
Pocket compasses
2111.15
Spherical glass compasses
2111.17
Nautical instruments
2111.19
Sextants
2111.21
Oceanographical, hydrological and hydrometric equipment
2111.62
Measuring heads, hydrologic
2111.67
Electric contact meters
2111.78
Recording levels